Medical wheelchair hub rubber injection mold and outer wheel rubber coating structure thereof

Abstract

The application discloses a medical wheelchair hub rubber injection mold and an outer wheel rubber coating structure, and belongs to the technical field of injection molds. The medical wheelchair hub rubber injection mold comprises a base and a moving seat. An upper mold is installed on the moving seat. A lower mold is installed on the base. A placing groove is formed in the top surface of the lower mold. A plurality of through holes are formed in the top surface of the placing groove. The through holes are arranged at equal intervals along the circumference of the placing groove. A push rod is installed on the lower mold through the through holes and can slide vertically. The top end of the push rod can abut against the bottom surface of a wheel spoke. A plurality of arc-shaped grooves are formed in the top surface of the placing groove. A moving rod is installed on the lower mold through the arc-shaped grooves and can abut against adjacent wheel spokes. The lower mold is provided with a driving assembly for driving the push rod to move upwards and a rotating assembly for pushing the moving rod to rotate. The application can reduce the risk of mold clamping and improve production efficiency.

Description

Technical Field

[0001] This application relates to the technical field of injection molds, and in particular to an injection mold for rubber coating of the hub of a medical wheelchair and its outer wheel rubber coating structure. Background Technology

[0002] With the increasing aging population and growing number of people with disabilities, medical wheelchairs, as an important assistive tool, are widely used in the daily lives of various patients and people with mobility impairments. The comfort, stability, and safety of wheelchairs directly affect the user's experience and health. The wheel hub is one of the core components of a wheelchair, bearing the functions of support and propulsion; therefore, the quality and structural design of the wheel hub are of paramount importance.

[0003] Traditional medical wheelchair wheels are mostly made of materials such as metal or plastic, but these materials have certain limitations in terms of strength, wear resistance, and impact resistance, especially prone to aging and wear during long-term use. Furthermore, the surface treatment and rubber coating process of the wheelchair are also key factors affecting its performance and comfort. To improve the comfort and safety of wheelchairs, medical wheelchair wheels typically require rubber coating technology to increase shock absorption, reduce noise, and provide better traction.

[0004] Currently, the rubber coating process for wheel hubs generally adopts injection molding technology. This process can effectively coat the surface of the wheel hub with rubber material. After injection molding, the wheel hub needs to be separated from the mold. In existing technology, the wheel hub is usually pushed out of the mold by lifting, but lifting can cause the mold to jam. Summary of the Invention

[0005] To address the potential mold jamming issue during wheel hub lifting, this application provides a wheel hub rubber coating injection mold for medical wheelchairs and its outer wheel rubber coating structure.

[0006] This application provides a rubber-coated injection mold for the hub of a medical wheelchair and its outer wheel rubber-coating structure, which adopts the following technical solution:

[0007] A rubber-coated injection mold for a medical wheelchair hub includes a base and a movable seat. An upper mold is mounted on the movable seat, and a lower mold is mounted on the base. The top surface of the lower mold has a placement groove, and the top surface of the placement groove has several through holes. The through holes are evenly spaced along the circumference of the placement groove. A push rod is vertically slidably mounted on the lower mold through the through holes. The top end of the push rod can abut against the bottom surface of the wheel spoke. The top surface of the placement groove has several arc-shaped grooves, and a moving rod is slidably mounted on the lower mold through the arc-shaped grooves. The moving rod can abut against adjacent wheel spokes. The lower mold is provided with a drive assembly for driving the push rod to move upward and a rotation assembly for driving the moving rod to rotate.

[0008] By adopting the above technical solution, after injection molding, the drive component drives the push rod to move upward, and at the same time, the rotating component drives the moving rod to rotate. The moving rod abuts against the wheel spoke, thereby providing a certain steering force to the wheel hub, making the wheel hub smoother during demolding, reducing the risk of mold jamming, and improving production efficiency.

[0009] Preferably, the drive assembly includes a plurality of rotating sleeves, the rotating sleeves being sleeved on the outer periphery of the push rod, the rotating sleeves being threadedly engaged with the push rod, a limiting block being fixed on the bottom surface of the push rod, a guide block being fixed on the base, and a square groove being formed on the top surface of the guide block, the limiting block being vertically slidably engaged with the base through the square groove.

[0010] By adopting the above technical solution, the limiting block moves vertically within the square groove, and the rotating sleeve is rotated, causing the push rod to move vertically so that the push rod can push the hub upward.

[0011] Preferably, a rotating ring is rotatably mounted on the base, a rotating gear is fixedly fitted on the outer circumferential surface of the rotating sleeve, an internal gear ring is fixed on the inner circumferential surface of the rotating ring, the rotating gear meshes with the internal gear ring, a rack is slidably mounted on the base along its own length direction, an external gear ring is fixedly fitted on the outer circumferential surface of the rotating ring, the rack meshes with the external gear ring, a cylinder is fixed on the base, and the piston rod end of the cylinder is fixedly connected to the end face of the rack.

[0012] By adopting the above technical solution, a drive cylinder is used, which drives the rack to move. The rack drives the outer gear ring to rotate, the outer gear ring drives the inner gear ring to rotate, and the inner gear ring drives several rotating gears to rotate synchronously, so that the push rod moves upward synchronously to ensure that the push rod smoothly lifts the wheel hub.

[0013] Preferably, the rotating assembly includes a connecting plate fixed to the bottom surface of the moving rod, and the connecting plate is fixedly connected to the top surface of the rotating ring.

[0014] By adopting the above technical solution, the rotating ring rotates while driving the connecting plate to rotate, and the connecting plate drives the moving rod to rotate, so that the moving plate moves along the arc groove.

[0015] Preferably, a control lever is rotatably mounted on the base, a control gear is fixedly fitted on the outer circumference of the control lever, the control gear meshes with the outer gear ring, a ratchet is fixedly fitted on the outer circumference of the control lever, and a pawl is rotatably mounted on the base, the pawl being able to insert into the tooth groove of the ratchet.

[0016] By adopting the above technical solution, when the upper mold and the lower mold abut each other, the pawl is inserted into the tooth groove of the ratchet, so that the control rod can only rotate in one direction, and thus the outer gear ring can also only rotate in one direction, so that the push rod can only move downward in one direction and cannot move upward, thereby reducing the possibility of the push rod moving upward; when the upper mold and the lower mold separate, the pawl disengages from the tooth groove of the ratchet, and the control rod can rotate in both directions, so that the push rod can move upward.

[0017] Preferably, a fixing plate is fixed on the base, and two fixing pieces are fixed on the side of the fixing plate near the pawl. A rotating rod is rotatably installed between the two fixing pieces. The pawl is sleeved and fixed on the outer periphery of the rotating rod. An electromagnet is fixed on the top surface of the fixing plate, and a magnetic block is fixed on the top end of the rotating rod. The magnetic block and the pawl are respectively located on both sides of the rotating rod. When the electromagnet is energized, it can attract the magnetic block.

[0018] By adopting the above technical solution, the magnetic block moves towards the electromagnet under the attraction of the electromagnet, the magnetic block drives the rotating rod to rotate, and the rotating rod drives the pawl to rotate towards the ratchet, so that the pawl is inserted into the tooth groove of the ratchet.

[0019] Preferably, a torsion spring is sleeved on the outer periphery of the rotating rod, one end of the torsion spring is fixedly connected to the pawl, and the other end of the torsion spring is fixedly connected to the fixing plate.

[0020] By adopting the above technical solution, when the electromagnet is not working, the pawl rotates away from the ratchet under the elastic force of the torsion spring, causing the pawl to disengage from the tooth groove of the ratchet.

[0021] Preferably, the top surface of the base has a control groove, and a control block is vertically slidably mounted on the base through the control groove. A spring is fixed to the bottom surface of the control block, and the bottom end of the spring is fixedly connected to the inner bottom surface of the control groove. A limit groove is formed in the inner wall of the control groove. A movable contact block is fixed to the side of the control block. The movable contact block slides vertically with the base through the limit groove. A fixed contact block is fixed to the inner bottom surface of the limit groove. The movable contact block can make electrical contact with the fixed contact block. The movable contact block is electrically connected to the electromagnet, and the fixed contact block is electrically connected to the power supply.

[0022] By adopting the above technical solution, when the upper mold and the lower mold are aligned, the moving seat abuts against the control block, the spring is in a compressed state, the moving contact block and the fixed contact block are in electrical contact, and the electromagnet is energized and works; when the upper mold and the lower mold are separated, the moving seat separates from the control block, and the control block moves upward under the elastic force of the spring, so that the moving contact block and the fixed contact block are separated, and the electromagnet is de-energized.

[0023] A rubber-coated outer wheel structure for a medical wheelchair includes a metal hub, the outer periphery of which is covered with a polyurethane outer wheel coating layer, and the outer surface of the polyurethane outer wheel coating layer is provided with anti-slip texture.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. After injection molding, the drive assembly drives the push rod to move upward, while the rotating assembly drives the moving rod to rotate. The moving rod abuts against the wheel spokes, thereby providing a certain steering force to the wheel hub, making the wheel hub smoother during demolding, reducing the risk of mold jamming, and improving production efficiency;

[0026] 2. Drive cylinder, the cylinder drives rack to move, rack drives outer gear ring to rotate, outer gear ring drives inner gear ring to rotate, inner gear ring drives several rotating gears to rotate synchronously, so that push rod moves upward synchronously, so as to ensure that push rod smoothly lifts the wheel hub;

[0027] 3. When the upper and lower molds abut each other, the pawl is inserted into the tooth groove of the ratchet, so that the control lever can only rotate in one direction, and thus the outer gear ring can also only rotate in one direction, so that the push rod can only move downward and cannot move upward, thereby reducing the possibility of the push rod moving upward; when the upper and lower molds separate, the pawl disengages from the tooth groove of the ratchet, and the control lever can rotate in both directions, so that the push rod can move upward. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the injection mold for coating the hub of a medical wheelchair according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the upper mold in the injection mold for rubber coating of medical wheelchairs according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the lower mold structure in the injection mold for rubber coating of medical wheelchairs according to an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the push rod and the moving rod in the injection mold for the wheel hub of a medical wheelchair according to an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the push rod structure in the rubber-coated injection mold for the wheel hub of a medical wheelchair according to an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the control rod structure in the injection mold for the wheel hub of a medical wheelchair according to an embodiment of this application.

[0034] Figure 7This is a cross-sectional view of the base in the injection mold for the wheel hub of a medical wheelchair according to an embodiment of this application.

[0035] Figure 8 yes Figure 7 Enlarged diagram of point A in the middle.

[0036] Figure 9 This is a schematic diagram of the overall structure of the rubber-coated outer wheel structure for a medical wheelchair according to an embodiment of this application.

[0037] Reference numerals: 1. Movable seat; 11. Upper mold; 2. Base; 21. Lower mold; 22. Placement slot; 23. Through hole; 24. Arc groove; 3. Push rod; 31. Rotating sleeve; 32. Limiting block; 33. Guide block; 34. Square groove; 35. Rotating gear; 4. Rotating ring; 41. Internal gear ring; 42. External gear ring; 43. Rack; 44. Cylinder; 5. Movable rod; 51. Connecting plate; 6. Control rod; 61. Control gear; 62. Ratchet; 63. Pawl; 7. Fixing plate; 71. Fixing piece; 72. Rotating rod; 73. Electromagnet; 74. Magnetic block; 75. Torsion spring; 8. Control block; 81. Control groove; 82. Spring; 83. Limiting groove; 84. Moving contact block; 85. Fixed contact block; 9. Metal hub; 91. Polyurethane outer wheel coating layer; 92. Anti-slip texture. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0039] This application discloses an injection mold for rubber coating of the hub of a medical wheelchair and its outer wheel rubber coating structure. (Refer to...) Figure 1 , Figure 2 and Figure 3 The injection mold for rubber coating of wheelchair hubs includes a base 2 and a movable base 1. An upper mold 11 is mounted on the movable base 1, and a lower mold 21 is mounted on the base 2. The top surface of the lower mold 21 has a placement groove 22, and the top surface of the placement groove 22 has several through holes 23, which are evenly spaced along the circumference of the placement groove 22. A push rod 3 is vertically slidably mounted on the lower mold 21 through the through holes 23, and the top end of the push rod 3 can abut against the bottom surface of the wheel spokes. The top surface of the placement groove 22 has an arc-shaped groove 24, which is evenly spaced along the circumference of the placement groove 22. A moving rod 5 is slidably mounted on the lower mold 21 through the arc-shaped groove 24, and the moving rod 5 can abut against adjacent wheel spokes.

[0040] Reference Figure 4 and Figure 5A rotating ring 4 is rotatably mounted on the base 2, and an external gear ring 42 is fixedly fitted onto the outer circumference of the rotating ring 4. A rack 43 is slidably mounted on the base 2 along its length, and the rack 43 meshes with the external gear ring 42. A cylinder 44 is fixed on the base 2, and the end of the piston rod of the cylinder 44 is fixedly connected to the end face of the rack 43. A rotating sleeve 31 is fixedly fitted onto the outer circumference of the push rod 3, and the rotating sleeve 31 is threadedly engaged with the push rod 3. A rotating gear 35 is fixedly fitted onto the outer circumference of the rotating sleeve 31, and an internal gear ring 41 is fixed onto the inner circumference of the rotating ring 4, and the rotating gear 35 meshes with the internal gear ring 41. A guide block 33 is fixed on the base 2, and a square groove 34 is formed on the top surface of the guide block 33. A limiting block 32 is fixed to the bottom surface of the push rod 3, and the limiting block 32 slides vertically with the base 2 through the square groove 34. A connecting plate 51 is fixed to the bottom surface of the moving rod 5, and the connecting plate 51 is fixedly connected to the top surface of the rotating ring 4.

[0041] The drive cylinder 44 drives the rack 43 to move, the rack 43 drives the outer gear ring 42 to rotate, the outer gear ring 42 drives the inner gear ring 41 to rotate, and the inner gear ring 41 drives several rotating gears 35 to rotate synchronously, so that the push rod 3 moves upward synchronously to ensure that the push rod 3 smoothly lifts the hub, and at the same time drives the connecting plate 51 to rotate, and the connecting plate 51 drives the moving rod 5 to rotate, so that the moving plate moves along the arc groove 24.

[0042] Reference Figure 4 and Figure 6 A control lever 6 is rotatably mounted on the base 2. A control gear 61 is fixedly fitted onto the outer circumference of the control lever 6, and the control gear 61 meshes with the outer gear ring 42. A ratchet 62 is fixedly fitted onto the outer circumference of the control lever 6, and a pawl 63 is rotatably mounted on the base 2. The pawl 63 can be inserted into the tooth groove of the ratchet 62.

[0043] Reference Figure 4 and Figure 6 A fixing plate 7 is fixed on the base 2. Two fixing pieces 71 are fixed on the side of the fixing plate 7 near the pawl 63. A rotating rod 72 is rotatably mounted between the two fixing pieces 71, and the pawl 63 is sleeved and fixed to the outer periphery of the rotating rod 72. An electromagnet 73 is fixed on the top surface of the fixing plate 7, and a magnetic block 74 is fixed on the top end of the rotating rod 72. The magnetic block 74 and the pawl 63 are located on opposite sides of the rotating rod 72, and the electromagnet 73 can attract the magnetic block 74 when energized. A torsion spring 75 is sleeved on the outer periphery of the rotating rod 72. One end of the torsion spring 75 is fixedly connected to the pawl 63, and the other end of the torsion spring 75 is fixedly connected to the fixing piece 71.

[0044] When the upper mold 11 and the lower mold 21 come into contact, the electromagnet 73 operates, and the magnetic block 74 moves towards the electromagnet 73 under its attraction. The magnetic block 74 drives the rotating rod 72 to rotate, and the rotating rod 72 drives the pawl 63 to rotate towards the ratchet 62, so that the pawl 63 inserts into the tooth groove of the ratchet 62. This makes the control rod 6 rotate only in one direction, and consequently, the outer gear ring 42 also rotates only in one direction. This makes the push rod 3 move only downward and not upward, thus reducing the possibility of the push rod 3 moving upward. When the upper mold 11 and the lower mold 21 separate, the electromagnet 73 stops operating, and the pawl 63 rotates away from the ratchet 62 under the elastic force of the torsion spring 75. This makes the pawl 63 disengage from the tooth groove of the ratchet 62, and the control rod 6 can rotate in both directions, allowing the push rod 3 to move upward.

[0045] Reference Figure 7 and Figure 8 The top surface of the base 2 has a control groove 81, and a control block 8 is vertically slidably mounted on the base 2 through the control groove 81. A spring 82 is fixed to the bottom surface of the control block 8, and the bottom end of the spring 82 is fixedly connected to the inner bottom surface of the control groove 81. A limit groove 83 is formed in the inner wall of the control groove 81, and a movable contact 84 is fixed to the side of the control block 8. The movable contact 84 slides vertically with the base 2 through the limit groove 83. A fixed contact 85 is fixed to the inner bottom surface of the limit groove 83. The movable contact 84 can make electrical contact with the fixed contact 85. The movable contact 84 is electrically connected to the electromagnet 73, and the fixed contact 85 is electrically connected to the power supply.

[0046] When the upper mold 11 and the lower mold 21 are engaged, the movable seat 1 abuts against the control block 8, the spring 82 is in a compressed state, the moving contact 84 and the fixed contact 85 are in electrical contact, and the electromagnet 73 is energized. When the upper mold 11 and the lower mold 21 are separated, the movable seat 1 separates from the control block 8, and the control block 8 moves upward under the elastic force of the spring 82, causing the moving contact 84 to separate from the fixed contact 85, and the electromagnet 73 is de-energized.

[0047] Reference Figure 9 The outer wheel coating structure for medical wheelchairs includes a metal hub 9, the outer periphery of which is covered with a polyurethane outer wheel coating layer 91, and the outer surface of the polyurethane outer wheel coating layer 91 is provided with anti-slip textures 92.

[0048] The implementation principle of the medical wheelchair hub rubber coating injection mold and its outer wheel rubber coating structure in this application embodiment is as follows: After injection molding, the push rod 3 is moved upward, and the moving rod 5 is rotated at the same time. The moving rod 5 abuts against the wheel spoke, thereby providing a certain steering force to the wheel hub, making the wheel hub smoother in the demolding process, reducing the risk of mold jamming, and improving production efficiency.

[0049] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rubber-coated injection mold for a medical wheelchair hub, characterized in that: The device includes a base (2) and a movable base (1). An upper mold (11) is mounted on the movable base (1), and a lower mold (21) is mounted on the base (2). The top surface of the lower mold (21) has a placement groove (22), and the top surface of the placement groove (22) has several through holes (23). The several through holes (23) are evenly spaced along the circumference of the placement groove (22). The lower mold (21) is mounted with a pusher that slides vertically through the through holes (23). The top end of the push rod (3) can abut against the bottom surface of the spoke. The top surface of the placement groove (22) is provided with several arc-shaped grooves (24). The lower mold (21) is slidably mounted with a moving rod (5) through the arc-shaped grooves (24). The moving rod (5) can abut against the adjacent spoke. The lower mold (21) is provided with a drive assembly for driving the push rod (3) to move upward and a rotation assembly for driving the moving rod (5) to rotate. The drive assembly includes several rotating sleeves (31), which are sleeved on the outer periphery of the push rod (3). The rotating sleeves (31) and the push rod (3) are threadedly connected. A limiting block (32) is fixed on the bottom surface of the push rod (3). A guide block (33) is fixed on the base (2). A square groove (34) is opened on the top surface of the guide block (33). The limiting block (32) slides vertically with the base (2) through the square groove (34). A rotating ring (4) is rotatably mounted on the base (2). A rotating gear (35) is fixedly fitted on the outer circumferential surface of the rotating sleeve (31). An internal gear ring (41) is fixed on the inner circumferential surface of the rotating ring (4). The rotating gear (35) meshes with the internal gear ring (41). A rack (43) is slidably mounted on the base (2) along its own length direction. An external gear ring (42) is fixedly fitted on the outer circumferential surface of the rotating ring (4). The rack (43) meshes with the external gear ring (42). A cylinder (44) is fixed on the base (2). The piston rod end of the cylinder (44) is fixedly connected to the end face of the rack (43). The rotating assembly includes a connecting plate (51) fixed to the bottom surface of the moving rod (5), and the connecting plate (51) is fixedly connected to the top surface of the rotating ring (4).

2. The injection mold for overmolding wheel hubs for medical wheelchairs according to claim 1, characterized in that: A control lever (6) is rotatably mounted on the base (2). A control gear (61) is fixedly fitted on the outer circumference of the control lever (6). The control gear (61) meshes with the outer gear ring (42). A ratchet (62) is fixedly fitted on the outer circumference of the control lever (6). A pawl (63) is rotatably mounted on the base (2). The pawl (63) can be inserted into the tooth groove of the ratchet (62).

3. The injection mold for rubber coating of wheelchair hubs according to claim 2, characterized in that: A fixing plate (7) is fixed on the base (2). Two fixing pieces (71) are fixed on the side of the fixing plate (7) near the pawl (63). A rotating rod (72) is rotatably installed between the two fixing pieces (71). The pawl (63) is sleeved and fixed on the outer periphery of the rotating rod (72). An electromagnet (73) is fixed on the top surface of the fixing plate (7). A magnetic block (74) is fixed on the top end of the rotating rod (72). The magnetic block (74) and the pawl (63) are located on the two sides of the rotating rod (72). The electromagnet (73) can attract the magnetic block (74) after being energized.

4. The injection mold for overmolding wheel hubs for medical wheelchairs according to claim 3, characterized in that: A torsion spring (75) is sleeved on the outer periphery of the rotating rod (72). One end of the torsion spring (75) is fixedly connected to the pawl (63), and the other end of the torsion spring (75) is fixedly connected to the fixing plate (71).

5. The injection mold for overmolding wheel hubs for medical wheelchairs according to claim 4, characterized in that: The top surface of the base (2) is provided with a control groove (81). The base (2) is vertically slidably mounted with a control block (8) through the control groove (81). A spring (82) is fixed on the bottom surface of the control block (8). The bottom end of the spring (82) is fixedly connected to the inner bottom surface of the control groove (81). A limit groove (83) is provided on the inner wall of the control groove (81). A movable contact block (84) is fixed on the side of the control block (8). The movable contact block (84) slides vertically with the base (2) through the limit groove (83). A fixed contact block (85) is fixed on the inner bottom surface of the limit groove (83). The movable contact block (84) can make electrical contact with the fixed contact block (85). The movable contact block (84) is electrically connected to the electromagnet (73). The fixed contact block (85) is electrically connected to the power supply.

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